The Research In Stability Of High Rock Sloped And Prestressed Anchor Cable Frame Beam Reinforcement

Slope stability research has always been a key research topic in the geotechnical engineering community.Rainfall and earthquakes are the most important causes of slope damage and the most direct factors of slope instability.It is of great significance to study the influence of rainfall infiltration and earthquake on the stability of rocky slopes and to derive the destabilization mechanism of rocky slopes,so as to counteract the destabilization measures of rocky slopes.Based on the rocky high slope project on the right side of ZK17+140～ZK17+280 of Jianhe-Liping Expressway in Guizhou Province,this study uses theoretical analysis,field monitoring and numerical simulation to study the stability of rocky high slope of reinforced prestressed anchor cable frame beam under the influence of different rainfall intensity conditions and different peak earthquake acceleration.The main contents and results of the paper are as follows:(1)According to the rocky high slope project,combined with its geological conditions and characteristics,summarize and analyze the deformation and damage mode of rocky high slope,as well as the main factors affecting the stability of rocky high slope,and analyze the mechanism of induced instability of rocky high slope from both rainfall and earthquake.(2)The rocky high slope after reinforcement by prestressed anchor frame beam is monitored on site,and the monitoring content mainly includes the deep soil displacement,anchor cable prestressing,and slope surface displacement of the slope.At the same time,FLAC3 D software was used to simulate the rocky high slope before and after reinforcement in the natural state.By comparing and verifying the numerical simulation results of the high slope after reinforcement in the natural state with the field monitoring data,and comparing the stability of the rocky slope before and after reinforcement,it shows that the reinforcement effect of the prestressed anchor cable frame beam is remarkable.(3)On the basis of rainfall infiltration theory and unsaturated shear strength theory,a model of rocky high slope reinforced by prestressed anchor cable frame beam is established to analyze the stability of reinforced rocky high slope and the force characteristics of anchor cable frame beam under different rainfall intensity and rainfall time conditions.According to the diffusion effect of the prestressed anchor cable frame beam,an improved Bishop bar division method is proposed to calculate the safety coefficient of the reinforced slope under rainfall conditions,and the final results are more reasonable and closer to the actual situation than the safety coefficient derived from numerical simulation.(4)The stability and deformation law of rocky high slope after reinforced by pre-stressed anchor cable frame beam under seismic dynamic response is analyzed by the proposed static method,and the displacement change,stress distribution,pore water pressure change,plastic zone distribution and dynamic response of anchor cable and frame beam under seismic action of the reinforced rocky slope are systematically analyzed to further evaluate the reinforcement effect of pre-stressed anchor cable frame beam.